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A173237
Alternate k and 10k for each k.
1
1, 10, 2, 20, 3, 30, 4, 40, 5, 50, 6, 60, 7, 70, 8, 80, 9, 90, 10, 100, 11, 110, 12, 120, 13, 130, 14, 140, 15, 150, 16, 160, 17, 170, 18, 180, 19, 190, 20, 200, 21, 210, 22, 220, 23, 230, 24, 240, 25, 250, 26, 260, 27, 270, 28, 280, 29, 290, 30, 300, 31, 310, 32, 320, 33
OFFSET
1,2
FORMULA
G.f.: x*(1+10*x) / ( (x-1)^2*(1+x)^2 ). - R. J. Mathar, Jun 18 2014
CROSSREFS
Sequence in context: A228276 A040099 A330365 * A319154 A086068 A262557
KEYWORD
nonn,easy
AUTHOR
Mark Dols, Feb 13 2010
STATUS
approved